Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert Atmosphere
Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert Atmosphere
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DOI：
10.1021/acs.nanolett.5b00648
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发表时间：
2015-08-01
期刊：
影响因子：
10.8
通讯作者：
Gorbachev, R. V.
中科院分区：
文献类型：
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作者：
Cao, Y.;Mishchenko, A.;Gorbachev, R. V.
许多层状材料可以分裂成单个原子平面，类似于石墨烯，但只有少数在环境条件下稳定。其余的在空气中反应和分解，这严重阻碍了它们的研究和潜在应用。在这里，我们介绍了一种补救方法的基础上分裂，转移，对齐，和封装的空气敏感的晶体，所有在一个受控的惰性气氛。为了说明这项技术，我们选择了两种典型的二维晶体，它们具有强烈的科学兴趣，但在空气中不稳定：黑磷和二硒化铌。我们的场效应器件由其单层制成，在环境条件下具有导电性和完全稳定性，这与在空气中加工的对应物形成对比。NbSe 2保持超导下降到单层厚度。从三层开始，磷烯器件达到足够高的迁移率以呈现朗道量子化。该方法提供了一个场地，以显着扩大实验可访问的二维晶体及其异质结构的范围。
Many layered materials can be cleaved down to individual atomic planes, similar to graphene, but only a small minority of them are stable under ambient conditions. The rest react and decompose in air, which has severely hindered their investigation and potential applications. Here we introduce a remedial approach based on cleavage, transfer, alignment, and encapsulation of air-sensitive crystals, all inside a controlled inert atmosphere. To illustrate the technology, we choose two archetypal two-dimensional crystals that are of intense scientific interest but are unstable in air: black phosphorus and niobium diselenide. Our field-effect devices made from their monolayers are conductive and fully stable under ambient conditions, which is in contrast to the counterparts processed in air. NbSe2 remains superconducting down to the monolayer thickness. Starting with a trilayer, phosphorene devices reach sufficiently high mobilities to exhibit Landau quantization. The approach offers a venue to significantly expand the range of experimentally accessible two-dimensional crystals and their heterostructures.